deepflow clickhouse supports configuring data retention periods

[wenhuwang]

Feature request

Clickhouse data scale increases exponentially with the number of applications, and it is recommended to support configurable data retention periods for the rational use of storage resources

[sharang]

Modifying Retention can be time-consuming when data is already stored in ClickHouse. Currently, the retention duration is initialized through the configuration of deepflow-server.yaml, and modification is not supported for the time being.